Cosmetic

Abstract

A cosmetic includes a component (a) and (b): wherein component (a) is a polyacrylic acid or a salt thereof or poly(2-acrylamido-2-methylpropanesulfonic acid) or a salt thereof that has a weight-average molecular weight of 500,000 to 8,000,000, is linear, and has a thread length of 10 mm or less at room temperature when formed into a 1% by mass solution, wherein the thread length is a distance determined by: bringing a round disk having a diameter of about 1 cm uniformly and lightly into contact with a surface of the solution; lowering a container that contains the solution at a velocity of 5 mm/sec, and measuring the distance that the container descended until a thread of the solution is cut, and component (b) is a crosslinked water-swellable polymer having a crosslinking density of 0.01 to 1% by mole, or a microgel obtained by pulverizing a gel consisting of a hydrophilic compound having gelating ability.

1 . A cosmetic, comprising:
 components (a) and (b) wherein;   component (a) is polyacrylic acid or a salt thereof or poly(2-acrylamido-2-methylpropanesulfonic acid) or a salt thereof that has a weight-average molecular weight of 500,000 to 8,000,000, is linear, and has a thread length of 10 mm or less at room temperature when formed into a 1% by mass solution, wherein the thread length is a distance determined by: putting a round disk having a diameter of about 1 cm uniformly and lightly into contact with a surface of the solution; lowering a container that contains the solution at a velocity of 5 mm/sec, and measuring the distance that the container descended until a thread of the solution is cut; and   component (b) is a crosslinked water-swellable polymer having a crosslinking density of 0.01 to 1% by mole, or a microgel obtained by pulverizing a gel consisting of a hydrophilic compound having gelating ability.   
     
     
         2 . The cosmetic, according to  claim 1 , wherein:
 the crosslinked water-swellable polymer of the component (b) is one or more selected from the group consisting of carboxyvinyl polymer, acrylamidealkylsulfonic acid/beheneth-25 crosslinked copolymer, acrylamidealkyl sulfonic acid/vinylpyrrolidone crosslinked copolymer, and acrylamidealkylsulfonic acid/alkylacrylamide crosslinked copolymer.   
     
     
         3 . The cosmetic, according to  claim 1 , wherein:
 the microgel of the component (b) is a hydrophilic polysaccharide.   
     
     
         4 . The cosmetic, according  claim 1 , wherein:
 a content of the compound having a molecular weight of 10,000,000 or more in the component (a) is 10% by mass or less.   
     
     
         5 . The cosmetic, according to  claim 2 , wherein:
 the microgel of the component (b) is a hydrophilic polysaccharide.   
     
     
         6 . The cosmetic, according to  claim 2 , wherein:
 the content of the compound having the molecular weight of 10,000,000 or more in the component (a) is 10% by mass or less.   
     
     
         7 . The cosmetic, according to  claim 3 , wherein:
 the content of the compound having the molecular weight of 10,000,000 or more in the component (a) is 10% by mass or less.